***ONE OWNER*** The 2017 GMC Sierra 1500 is available in four trim levels: base, SLE, SLT and Denali. Base Sierras are fairly bare-bones, which is fine if you're looking for a work truck. It comes with a 4.3-liter V6 (285 horsepower, 305 pound-feet of torque), though a 5.3-liter V8 (355 hp, 383 lb-ft of torque) is optional. For any kind of regular use, you'll want more creature comforts than the base Sierra delivers as standard. The SLE trim level adds a backup camera, an upgraded infotainment unit, 17-inch aluminum wheels, and a leather-wrapped steering wheel with an optional telescoping column. Stepping up to the SLT, our trim level of choice, nets you the 5.3-liter V8 engine, towing hardware, power-folding and heated mirrors, and heated leather seats. The SLT's standard V8 engine paired with the available eight-speed automatic forms our preferred Sierra powertrain. A 6.2-liter V8 (420 hp, 460 lb-ft of torque) becomes an option at the SLT level. Parking alerts become available, too, and they're terrifically handy in a full-size pickup. At the top of the range is the Denali, which comes with most of the features available on lower trim levels and has all of the available driver assistance features. It adds exclusive Magnetic Ride Control dampers, 20-inch wheels and unique interior appointments.